US 11,674,898 B2
System and method for determining a gas concentration in a container
Märta Lewander Xu, Lund (SE); and Patrik Lundin, Harlösa (SE)
Assigned to GasPorOx AB, Lund (SE)
Appl. No. 17/281,938
Filed by GasPorOx AB, Lund (SE)
PCT Filed Oct. 1, 2019, PCT No. PCT/EP2019/076665
§ 371(c)(1), (2) Date Mar. 31, 2021,
PCT Pub. No. WO2020/070173, PCT Pub. Date Apr. 9, 2020.
Prior Publication US 2021/0381966 A1, Dec. 9, 2021
Int. Cl. G01N 21/39 (2006.01); G01N 21/41 (2006.01)
CPC G01N 21/39 (2013.01) [G01N 21/41 (2013.01); G01N 2021/399 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of determining a concentration of at least one gas in a container, the method comprising:
transmitting light from a light source through a volume of the at least one gas located inside the container;
detecting light reflected by a surface inside or behind the container, or light refracted or scattered by the container, with a detector, wherein the detector comprises a position sensitive detector (PSD) and is configured to provide a first signal related to an intensity of the light reflected by the surface or light refracted or scattered by the container, and a second signal related to a position of reflected, refracted or scattered light being detected;
determining an absorption of the at least one gas inside the container based on the first signal;
determining a distance that light travels through said container based on the second signal; and
estimating a concentration of the at least one gas inside the container, based on the absorption and the distance.